Boring-tool.



E. W. CLARK.

BORING TOOL APPLICATION FILED DEC. 19, 1914.

Patented Oct. 15, 1918.

wimesseS AF 7%zw/JW ELWARD W. CLARK, OF

LOS ANGELES, CALIFORNIA, AQSIGNOR oI pNE-IIALF TO ALVIN WELLS, 0F LOS ANGELES, CALIFORNIA.

BORING-TOOL.

- Specification of Letters Patent. Patented 0 1;, 15, 1918 Application filed December 19, 1914. Serial No.- 878,050.

To all whom it may concern:

- Be it known that I, EDWARD W. CLARK,

a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented certain new and useful Im rovements in Bo'ring-Tools, of which the ollowing is a specification.

This invention relates to improvements in boring tools or implements and particularly to that class of boring devices that are adaptface is required. 1

It is an object of the invention to provide a boring tool capable of using a plurality'of cutters simultaneously, an adjustable. scale device being provided for accurately setting all of the cutters for producing the cut or bore desired; j n, It is also an object of the invention to ipIOVIdB a boring tool with a plurality of inclined divergingputters and with means for adjusting said cutters to enlarge the cut made, said means being adjustableupon the shankofthe tool.

It is a further object of the invention to provide a boring. tool with a plurality o'i cutters, a micrometer device being also provided for accurately adjusting and setting the said cutters.

It is a still further object'of the invention to provide a boring tool in which the cutters maybe set'at such an angle as to extend into the corners of a bore which is closed at its inner end.

It is also a further object of the invention to provide a boring tool iii which a plurality of diverging cutters are 'used, and in which intermediate spacing on guide pieces are employed for preventing the cutters and the boring tool carrying/the same from being sprung out of true by'operating upon material portions of which are harder than other portions thereof.

In the accompanying drawing forming a part of this specification: Figure 1 is a side elevation of a boring tool constructed in accordance with the pres ent invention. the walls of an article being bored thereby, being shown in section.

Fig. 2 a central longitudinal sectional view through the said boring tool, aportion of the shank thereofbeing shown in side elevation, and a portion ofsaid shank being also broken away. I

Fig. 3 is an end elevation of the saidboring tool, looking at the endlthereof which carries the cutters; i

v Fig. 4 is a fragmentary detail sectional view through the edge portion of the head 'of the tool showing a cutter and a pilot; I

piece in advance thereof.

Fig; is a similar sectional view but showng a pilot piece following a cutter.

The device of the present invention is of V such a character that a plurality of cutters,

or implement, the said tool being provided with an ad usting member adapted .to set or adjust all of the cutters simultaneouslyv and equally for causing each cutter to cut.

may be employed upon a single boring toolf v and remove an equal amount of. material from the bore being produced. The details and features of the invention will now be more specifically described with reference to portion 3- at the other end thereof.

the accompanying drawing in which 1 indi- The head 2 is provided with a beveled-Z peripheral edge 4 made of suitable width tooffer a proper support to the cutters 5 which are carried thereby. The beveled surface is preferably approximately at. an angle of about 45- degrees with respect to the shank 1,

though it should be understood that itmay be ata greater or less angle thereto if desired. At suitable intervals upon said beveled edge 4, socketsor recesses 6 are formed to receive the cutters 5. There are a plurality of such recesses and generally a suflicient number to receive say, from four to eight cutters as desired.-

The cutters are suitably shaped at their I outer ends to cut the metal from the surface of the article to be bored, while their inner ends are preferably cut square across so as to fit against the beveled end 7 of an adjusting member or sleeve 8. The portion of the shank 1 back of the head 2 is provided with suitable screw threads for. a short distance and the sleeve 8 is also provided upon its inner surface with corresl'io'nding threads, so that the said sleeve may be adjusted toward or away from the head 2. The head 2 is' flared portion or flange 10 adapted to engage the cutters and grip them tightly 1n them recesses, after they havebeen adjusted. The said clamping ring 9 1s provided with interior screw threads adapted to engage correspondingthreads 11 formed upon a portion of the said sleeve 8, all as clearly shown in Figs. 1 and 2 of the drawing.

of the said sleeve.

To assist in fine adjustmentsof the cut- ,ters' the device-is provided w th a micrometer mechanism, the sleeve 8 actlng as a micromter head 2 with a plurality of recesses 6, it will be seen thatany desired number of cutters may be employed.

In many instances it is desirable to employ pilot means in insuring'a proper direction in the movement of the boring tool and for this reason the cutter head 2 is provided with intermediate sockets or recesses 18 in which pilot bars or pieces 19 may be set. The said pilot pieces 19 as, shown in Fig.4 of the drawing will thus be a little in advance of the cutters in moving through the bore of the cylinder or other article and will engage the inner surface of said article in such a way as'to properly pilot or direct the boring tool as the boring operation progresses.

If desired the pilot means employed may i .be' caused to follow the cutters instead of leadlng them. Thus as shown'in Fig. 5 the cutters 5 are set in the deeper sockets or reeter screw andbeing provided'wi h ebcesses 18 and pilot pieces or bars 20 are indications at '12 extending longitudinally sleeve.8 is-amicrometer ring 13 having an opening at 14 closely fitting upon the stem 1 and a set screw or other suitable 'means for clamping the ring tightly upon said stem 1. The ring-13 has a flange 16 overhanging and. telescoping upon the' adjacent end of 5 the sleeve 8, said flange being provided with an annular beveled surface carrylnga scale, I 17 forcooperating with the scale 12, in the sired for producing the required bore.

cut ting operation.

manner usual withmicrometer devices. By means of this micrometer mechanism. the sleeve 8 may be accurately set for moving the cutters 5 outwardly to just the degree de- In use the cutters ,5 are all made the same length, their cutting points being ground so as to give the proper clearance during the The cutters are then placed in the sockets 6 and by turning the .-sleeve 8 with respect to'the micrometer ring 13 the cutters may be adjusted accurately according to the micrometer scales so as to remove the required amount of material from the surface of the article, to produce a bore of the desired size. After thus properly adjusting the cutters by the manlpulation of the sleeve 8, the 'clamp ring 9 is smooth and even re'sult, and without the tightened upon the cutters to hold them firmly in adjusted position.

The tool is of course employed in connection with a drill-press or other'mechanism,

that will properly rotate the same and which.

is provided with a mechanism for feeding the tool forward in the bore. I find in practice'that a plurality of cutters, usually about Cooperating with the 7 four, thus operating in a bore, each do a.

small portion of the work, producing a very tendency of springing any of the cutters out of place or out of desired alinement as the work pregresses; By providing the cut- .placed in the shallower recesses 6.

said pilot pieces or bars 20 Will thus to be made a trifle The have shorter than the cutters so as to move upon the surface of the bore reaming a bore that is closed at one end as indicatedin. Fig. 1, the pilot pieces or bars should follow the cutters and not lead them. The use of such pilot pieces or bars is especially valuable where the metal bored has portions which are harder than others and preventthe cutters anddrill tool from being sprung out of position or true alinement when they encounter said harder porv tions'. When the pilots or the cutters are set in. the deeper sockets 18 it is necessary to insert liners 21 to fill the spaces between them and the flange 4 of the clamping ring v 9 whereby the said clamping ring will bear.

upon and hold in place ters and pilots.

It will be understood that the adjustment of the sleeve 8 toward the head 2 will move the cutters and also the pilot pieces when employed, outwardly in their sockets for giving the proper diameter to the bore to "be produced, and also tocompensate for any shortening of the cutters by reason of their being ground or sharpened from time to time.

all of the said cut- The pilots are of course shortened in accordance with the length of the cutters after the cutters are ground. Themicrometer mechanismaids materially in quickly adjusting the cutters to a very fine degree. Of course it .will be understood that the minor details of construction may be, somewhat altered within the scope of the appended claims, and that the angle at which the cutters are held may be different in different tools. So also the sleeve having one scale of a micrometer the nu ber of sockets provided for cutters device formed thereon, and a micrometer or pilot pieces may be increased or diminished as desired all within the scope of the said claims. 7

What is claimed is:

1. A boring tool comprising a stem having an enlarged head thereon, a plurality of cutters slidably held on said head and radiating therefrom in diagonal planes, an adjustable Sleeve for said cutters ad ustable relative to said stem, and a clamping member adjustable relative to said sleeve for holding said cutters in operating position.

' evenly with respect tool comprising a stem having 2'. A boring an enlarged head thereon, carried thereby, an adjustable sleeve on said stem for engagement'with and-fixing the positions of said cutters, a clamping ring adjustable on said sleeve for engagement with the cutters and micrometer means on said stem and said sleeve for setting said cutters. 1

3. A boring tool comprising a head having a pluralit of radiating and tapering seats formed tl ierein, a stem on said head, cutters slidably held in said seats, a sleeve adjustable on said stem and engaging all of said cutters, and means adjustable-on said sleeve for holding said cutters in position.

4. A boring tool spreading head, cutters carried thereby and an adjustable member carried by the tool and having a beveled edge approximately at right angles tothe said cutters" for bearing against the inner ends of thecutters to adjust them on said flaring head and hold them and a clamp sleeve bearing on said cutters to hold them in adjusted positions. j 5. A boring tool having a head portion formed with a stem, and a beveled periphery with cutter carrying sockets in the beveled surface thereof, cutters in said sockets, an adjusting sleeve carried by said stem and adapted to bear upon the inner end of cutters, and a clamping sleeve carried by the cutter adjusting sleeve, said cutters adapted to be ripped between the said head and the sai clamping sleeve. i

6. A boring tool having a head adapted to carry divergent cutters, a sleeve having a beveled edge for engaging the inner ends of the cutters, cutters carried by said head and engaging said sleeve, aclamping -rin for pressing the cutters against said hea cutters extensibly I 9. A boring'tool having a flaring cutter to the bore to be. cut, a

other depth for guiding the cutters in operation, and means for clamping the cutters and pilot pieces in place.

having a head provided with a plurality of sockets some of which are deeper than others, cutters mounted in the sockets of one depth, pilot pieces mounted in the sockets of another depth, an adjusting member engaging the ends of said cutters and pilot pieces and a clamping member for gripping the said cutters and pilot pieces for. holding them in adjusted position.

10. A boring tool comprising an integral stem and head provided with outwardly taperin andradiating cutter seats, cutters extensib y held in said seats, a sleeve on said stein for engagement with the inner ends of said cutters, and a ring on said sleeve for engagement with the sides of said cutters, said sleeveand ring being adjustable relative to said stem, for adjusting the positions of the cutters.

11. A boring tool comprising a stem with ahead thereon provided with a plurality of tapered cutter sockets, utters in said sockets, a sleeve adjustably held on said stem 1 and having an end portion engaging all of said cutters, a relatively adjustable clamping member for engagementwith said cutters and a micrometer carriedby said stem for accurately setting the cutters.

In testimony whereof, I have hereunto set my hand, in presence of two witnesses.

I EDWARD W. CLARK. Witnesses i a OASSELL SnvnRANcn, EARLE R. PoLLARn.

7. A boring tool having radiating cutters 

